DevTools: [CSS] Add CSS.editRangeInStyleSheetText() to the protocol

Source/wtf/text/TextPosition.cpp

 /*
  * Copyright (C) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
             break;
 
         result->append(static_cast<unsigned>(lineEnd));
         start = lineEnd + 1;
     }
     result->append(text.length());
 
     return result.release();
 }
 
+OrdinalNumber TextPosition::toOffsetPosition(const Vector<unsigned>& lineEndings)
+{
+    unsigned lineStartOffset = m_line != OrdinalNumber::first() ? lineEndings.at(m_line.zeroBasedInt() - 1) + 1 : 0;
+    return OrdinalNumber::fromZeroBasedInt(lineStartOffset + m_column.zeroBasedInt());
+}
+
 TextPosition TextPosition::fromOffsetAndLineEndings(unsigned offset, const Vector<unsigned>& lineEndings)
 {
     const unsigned* foundLineEnding = std::lower_bound(lineEndings.begin(), lineEndings.end(), offset);
     int lineIndex = foundLineEnding - &lineEndings.at(0);
     unsigned lineStartOffset = lineIndex > 0 ? lineEndings.at(lineIndex - 1) + 1 : 0;
     int column = offset - lineStartOffset;
     return TextPosition(OrdinalNumber::fromZeroBasedInt(lineIndex), OrdinalNumber::fromZeroBasedInt(column));
 }
 
 } // namespace WTF